Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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Ранее очередной снежный рекорд побила Москва. Столичные сугробы обновили суточный рекорд, шестой в феврале и восьмой с начала года: высота снежного покрова добралась до отметки 72 сантиметра.，详情可参考旺商聊官方下载
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.